CN214682349U - Venturi powder suction assembly, powder supply pump and powder coating electrostatic spray gun - Google Patents

Abstract

The utility model relates to a powder coating spraying technical field, concretely relates to powder coating static spray gun, including static spray gun and confession powder pump, supply the powder pump to include that the venturi inhales the powder subassembly, the venturi inhales the powder subassembly and includes that venturi and cover establish at the outer lag section of thick bamboo of venturi, venturi including consecutive and coaxial entrance section, shrink section, throat, diffuser segment, first export section, second export section and third export section, offer on the lag section of thick bamboo and be used for communicating its inner chamber to outside atomizing through-hole, the outer wall of second export section with there is the interval just between the inner wall of lag section of thick bamboo be provided with on the second export section and be used for communicating its inner chamber to atomizing through-hole's atomizing gas port. The powder coating is diffused in the diffusion section, gaps among powder particles are enlarged, the powder coating is scattered by the atomizing air in the second outlet section, and the full and uniform powder-air mixing is realized, so that the coating quality is improved.

Description

Venturi powder suction assembly, powder supply pump and powder coating electrostatic spray gun

Technical Field

The utility model relates to a powder coating spraying device technical field, concretely relates to powder coating electrostatic spray gun.

Background

The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like, and is different from common solvent-based coatings and water-based coatings, the dispersion medium of the powder coating is not solvent and water but air, and the powder coating has the advantages of no solvent pollution, 100% film forming and the like and is widely used. When powder coating is used for spraying, an electrostatic spray gun, a powder pump and the like are usually required to be matched for use, in the traditional spraying process, the powder coating and compressed air are mixed through a powder-air mixing powder pump and then are sent into the electrostatic spray gun, an electrostatic generator in the electrostatic spray gun charges powder particles, and the powder particles are sprayed out of a gun mouth of the spray gun to the surface of a workpiece under the action of air flow and electrostatic attraction. Most of powder pumps on the traditional electrostatic spray gun only have one air inlet and only work by compressed air inflatable type, so that powder is not uniformly discharged, and the spraying quality is influenced.

In view of the above problems, there is an electrostatic spray gun having two air inlets on a powder pump, such as the experimental spray gun disclosed in chinese patent with application number 201721651224.4, which includes a gun-shaped housing and a powder-air mixing device, wherein the powder-air mixing device includes a main body and a venturi; the main body is of a hollow structure, the upper part of the main body is provided with a powder flow passage which is communicated with the powder outlet, the right end of the main body is provided with a compressed air passage, the diameter of the left end of the compressed air passage is smaller than that of the right end, and the lower part of the compressed air passage is provided with an atomized air passage; the Venturi tube is sleeved inside the body and comprises an air outlet section and an air inlet section, a flange and a blind hole are arranged at the junction of the right end of the air outlet section and the left end of the air inlet section, and the blind hole is arranged in the air inlet section and communicated with the atomized air passage. When the experimental spray gun works, powder coating enters the powder-air mixing device through the powder cup, the powder outlet and the powder flow channel to be mixed with compressed air, and meanwhile, atomized air enters the venturi tube through the blind hole to form rotary atomized air flow, so that the powder coating in the venturi tube is scattered, sufficient powder-air mixing is realized, the uniform and dense mixed powder air sprayed by the spray gun is ensured, and the coating quality is improved. However, the blind hole in the patent is formed at the junction of the air inlet section and the air outlet section of the venturi, the powder coating reaching the junction is not diffused by the venturi, and the distance between powder particles is small, so that the blind hole is blocked to a certain extent, atomized air flow is difficult to enter the venturi from the blind hole, and the powder-air mixing effect is poor; the venturi is directly sleeved in the body, the whole venturi needs to bear larger pressure, and the distance between the venturi and the body is extremely small, so that atomized air can only enter adjacent blind holes, and the blind hole at the far end cannot play a role; in addition, in actual use, because the color, specification and the like of the powder coating used each time are different, in order to prevent the residual powder coating from being mixed into new powder coating, the powder and air mixing device needs to be cleaned after each use, so that frequent disassembly and assembly are needed, and the powder and air mixing device and the gun body in the patent are in threaded connection, so that the disassembly and assembly are inconvenient, and the working efficiency is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical problem to improve, namely the utility model aims to provide a venturi powder absorbing component, which comprises a venturi tube and a protective sleeve arranged outside the venturi tube, wherein the venturi tube comprises an inlet section, a contraction section, a throat, a diffusion section, a first outlet section, a second outlet section and a third outlet section which are sequentially connected and coaxial; the diameter of the inner cavity of the throat is the smallest, the inner cavity of the contraction section is contracted to the inner cavity of the throat from the inner cavity of the inlet section along the axial direction, and the inner cavity of the diffusion section is expanded to the inner cavity of the first outlet section from the inner cavity of the throat along the axial direction; the protective sleeve is provided with an atomization through hole for communicating the inner cavity of the protective sleeve to the outside, an interval exists between the outer wall of the second outlet section and the inner wall of the protective sleeve, and the second outlet section is provided with an atomization air port for communicating the inner cavity of the second outlet section to the atomization through hole.

As the utility model discloses a preferred, the atomizing gas port wind the central axis circumference array of second export section is arranged, and every the atomizing gas port all radially corresponds one the atomizing through-hole.

As the utility model discloses a preferred, venturi passes through entry section outer wall with first export section outer wall with the extrusion of protective sleeve inner wall is realized that the registrate is fixed.

As the utility model discloses a preferred, the outer wall of third export section with the inner wall of protective sleeve extrudees each other.

As a preferred aspect of the present invention, the outer wall diameter of the throat is smaller than the outer wall diameter of the inlet section and the first outlet section, and the outer wall of the contracted section axially contracts to the outer wall of the throat from the outer wall of the inlet section, and the outer wall of the divergent section axially expands to the outer wall of the first outlet section from the outer wall of the throat.

As the utility model discloses a preferred, on the outer wall of entry section with all be provided with the first leather collar that is used for the fastening on the outer wall of first export section.

The utility model provides a supply powder pump, includes the venturi inhales the powder subassembly, still includes cross shell, powder cup device, compressed air connector and atomizing air connector, the cross shell has the confession the venturi inhales the subassembly inserting groove that the powder subassembly was pegged graft, supplies the side inserting groove that the powder cup device was pegged graft, supplies first inserting groove and the confession that the compressed air connector was pegged graft the second inserting groove that the atomizing air connector was pegged graft, first inserting groove with the subassembly inserting groove communicates each other along vertical direction, the side inserting groove communicates along the horizontal direction first inserting groove, the second inserting groove communicates along the horizontal direction the subassembly inserting groove.

As the utility model discloses a preferred, powder cup device includes toper powder cup and follows the powder pipe that send that the horizontal direction extends, toper powder cup has opening packing mouth and the first powder mouth that send of opening down, first powder mouth that send with send the powder pipe to be linked together, send a side end of powder pipe have the second send the powder mouth and can with the rotatable grafting cooperation of side inserting groove.

As the utility model discloses a preferred, the last position that is located of powder feeding pipe the position of first powder feeding mouth below is provided with the governing valve that is used for adjusting the powder volume of sending.

The utility model provides a powder coating electrostatic spray gun, includes supply the powder pump, still includes electrostatic spray gun, electrostatic spray gun includes the rifle body and stock, stock inside be provided with the rifle body is inside to be linked together and to extend to the conveyer pipe of stock lower extreme, supply the powder pump to pass through the venturi inhale the powder subassembly and peg graft on the conveyer pipe.

Has the advantages that:

1) the diffusion section enlarges the gaps among powder particles in the powder coating, so that atomized air can break up the powder coating;

2) the first outlet section buffers the powder coating, so that the powder particles gradually tend to be uniform, and gaps among the powder particles are substantially consistent;

3) after the powder coating enters the second outlet section, gaps among powder particles of the powder coating are enlarged and are uniform, so that atomized air can smoothly enter the venturi tube through the atomization air port to be contacted with the powder coating and enter the gaps among the powder particles to scatter the powder coating, uniform mixing of the powder coating and compressed air is realized, and the coating quality is improved;

4) a space is formed between the outer wall of the second outlet section and the inner wall of the protective sleeve, so that atomized air can enter each atomization air port, and the atomization effect is ensured;

5) the atomization air ports are circumferentially arrayed around the central axis of the second outlet section, each atomization air port corresponds to one atomization through hole along the radial direction, compressed air can enter the inner cavity of the protective sleeve from the multiple atomization through holes and then enter the second outlet section of the Venturi tube through the multiple atomization air ports, and the atomization effect is further improved;

6) the zigzag structure on the outer wall of the Venturi tube enables a local triangular stable space to be formed between the outer wall of the Venturi tube and the inner wall of the protective sleeve, so that the compressive strength of the inlet section, the contraction section, the throat, the diffusion section and the first outlet section is improved;

7) the outer wall of the third outlet section and the inner wall of the protective sleeve are mutually extruded, so that the stability of sleeving and fixing between the Venturi tube and the protective sleeve is further improved, and meanwhile, the space between the outer wall of the second outlet section and the inner wall of the protective sleeve is blocked in the vertical direction, so that the utilization efficiency of atomized air is greatly improved, the energy is saved, and the atomization effect is also improved;

8) the protective sleeve realizes the insertion by the extrusion of the peripheries of the three convex rings and the component insertion groove, and reduces the resistance by reducing the contact area with the component insertion groove, so that the disassembly and the assembly are more convenient;

9) the two first convex rings clamp the atomizing through hole in the middle, so that an annular area is formed between the atomizing through hole and the assembly inserting groove, and the area is blocked by the two first convex rings in the vertical direction, so that the utilization rate of atomizing air is effectively improved, the efficiency of the atomizing air entering the Venturi tube is also improved, and the atomizing effect is improved;

10) the powder cup device can be rotated to keep the filling opening of the conical powder cup in an upward state as much as possible, so that the powder coating in the conical powder cup is prevented from being scattered;

11) the setting of governing valve makes powder coating just be restricted the powder volume before entering into the cross shell, need not to change the powder volume of sending through changing compressed air volume, has guaranteed that the spraying quality is not influenced.

Drawings

FIG. 1 is a cross-sectional view of a venturi suction assembly;

FIG. 2 is a fragmentary schematic view of the venturi;

FIG. 3 is a schematic perspective view of the venturi;

FIG. 4 is a schematic perspective view of the protective sleeve;

FIG. 5 is a schematic view of a powder supply pump;

FIG. 6 is a schematic diagram showing the positional relationship among the component insertion grooves, the side insertion grooves, the first insertion grooves and the second insertion grooves in the four-way housing;

FIG. 7 is a schematic structural view of a powder cup device;

FIG. 8 is a schematic diagram of the overall structure of an electrostatic spray gun for powder coating materials according to the present invention;

in the figure: a. venturi powder suction assembly, b, powder supply pump, c, electrostatic spray gun, 1, venturi tube, 2, protective sleeve, 11, inlet section, 12, contraction section, 13, throat, 14, diffusion section, 15, first outlet section, 16, second outlet section, 17, third outlet section, 18, atomizing air port, 19, first leather collar, 21, atomizing through hole, 22, second leather collar, 23, first convex ring, 24, second convex ring, 25, third convex ring, 26, blocking ring, 3, four-way housing, 4, powder cup device, 5, compressed air connector, 6, atomizing air connector, 31, assembly insertion groove, 32, side insertion groove, 33, first insertion groove, 34, second insertion groove, 41, conical powder cup, 42, powder feeding pipe, 43, regulating valve, 411, filler, 412, first powder feeding port, 421, second powder feeding port, 7, gun body, 8, gun handle, 9, A delivery pipe.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

Fig. 1 shows that venturi inhales powder subassembly a includes venturi 1 and cover and establishes the lag sleeve 2 outside venturi 1, and wherein venturi 1 utilizes and penetrates the transport of inhaling the principle completion to powder coating, and this embodiment makes the improvement to venturi 1's structure for making venturi 1 penetrate the effect of inhaling and combine better with the atomizing effect to the powder. The venturi tube 1 in this embodiment includes an inlet section 11, a contraction section 12, a throat 13, a diffusion section 14, a first outlet section 15, a second outlet section 16, and a third outlet section 17, which are connected in sequence and coaxial, each section of the venturi tube 1 is divided by a dotted line section in fig. 2, wherein the diameter of the inner cavity of the throat 13 is the smallest, the inner cavity of the contraction section 12 is contracted from the inner cavity of the inlet section 11 to the inner cavity of the throat 13 along the axial direction, the inner cavity of the diffuser section 14 is expanded from the inner cavity of the throat 13 to the inner cavity of the first outlet section 15 along the axial direction, obviously, the diameter of the inner cavity formed by connecting the contraction section 12, the throat 13 and the diffuser section 14 into a whole changes to realize the Venturi effect, that is, when the compressed air flows from the contraction section 12 to the throat 13, the flow rate thereof is increased, so that the air pressure in the diffusion section 14 behind the throat 13 is relatively low, thereby generating adsorption to drive the air flow. In actual use, the powder coating enters the contraction section 12 along with the compressed air from the inlet section 11 of the venturi tube 1, and is then ejected and sucked into the diffusion section 14 under the action of the venturi effect, so that the powder coating is conveyed. The diffuser section 14 has a diffusing effect on the powder coating material, i.e. the gaps between the powder particles of the powder coating material are increased after the powder coating material has entered the diffuser section 14. When the powder coating enters the throat 13, the distance between the powder particles is extremely small, the powder particles are gathered together, even the powder coating at this moment can be regarded as a rigid body with a thick texture, a certain blocking effect is provided for the atomizing air port 18 arranged on the venturi tube 1, so that the atomizing air is difficult to enter the venturi tube 1 through the atomizing air port 18, and the atomizing air which is barely entered into the venturi tube 1 is difficult to scatter the powder coating due to the extremely small distance between the powder particles, so that the atomizing air is difficult to play a role, and the powder and the air are not uniformly mixed. Therefore, in the present embodiment, the first outlet section 15 and the second outlet section 16 are disposed behind the diffuser section 14, and the atomizing air port 18 is disposed on the second outlet section 16, so that the powder coating is fully diffused in the diffuser section 14, the diffuser section 14 mainly plays a role of increasing the gap between the powder particles to facilitate the contact between the atomizing air and the powder particles, and the diffused powder particles are still in an active disordered state, i.e. the gap between the powder particles is not uniform in size and is not favorable for the contact with the atomizing air in this stage, so the arrangement of the first outlet section 15 allows the powder coating to be buffered, the powder particles gradually become uniform in this stage, the gap between the powder particles is also substantially uniform, when the powder coating enters the second outlet section 16, the atomizing air can smoothly enter the venturi tube 1 through the atomizing air port 18 to contact with the powder coating, then the atomized air enters the gaps of the powder particles to break up the powder coating, so that the powder coating and the compressed air are uniformly mixed, and the coating quality is improved.

Venturi 1 overcoat is equipped with protective sleeve section of thick bamboo 2, and atomizing air need enter into protective sleeve section of thick bamboo 2 earlier inside, enters into venturi 1 from atomizing gas port 18 again inside, so offer on the protective sleeve section of thick bamboo 2 and be used for communicating its inner chamber to outside atomizing through-hole 21, the atomizing gas port 18 of seting up on second export section 16 then is used for communicating the inner chamber of second export section 16 to atomizing through-hole 21. Because the number of the atomizing air openings 18 on the second outlet section 16 is usually more than one, and the atomizing air enters the atomizing through hole 21 from only one side, the atomizing air may only enter the atomizing air opening 18 facing the atomizing through hole 21, and the atomizing air opening 18 not facing the atomizing through hole 21 is difficult to function, so that the atomizing effect is reduced, therefore, in the embodiment, a space exists between the outer wall of the second outlet section 16 and the inner wall of the protective sleeve 2, and the design has the advantage that as long as the atomizing air enters the inner cavity of the protective sleeve 2 through the atomizing through hole 21, the atomizing air can flow in the space, so as to enter each atomizing air opening 18, and the atomizing effect is ensured. Further improve, the atomizing air ports 18 are arranged in a circumferential array around the central axis of the second outlet section 16 in this embodiment, each atomizing air port 18 corresponds to one atomizing through hole 21 along the radial direction, compressed air can enter the inner cavity of the protective sleeve 2 from a plurality of atomizing through holes 21, and then enters the second outlet section 16 of the venturi tube 1 through a plurality of atomizing air ports 18, so that the atomizing effect is further improved.

Venturi 1 realizes the registrate fixedly through the extrusion of its entry section 11 outer wall and first export section 15 outer wall and protective sleeve 2 inner wall in this embodiment, and the form of pegging graft is taken in the installation between the two promptly, easy dismounting, the clearance of being convenient for. However, the mode of inserting the venturi tube 1 by pressing each other causes the inlet section 11 and the first outlet section 15 on the venturi tube 1 to bear a larger pressure, and is easily damaged, therefore, it is preferable in this embodiment that the diameter of the outer wall of the throat 13 is smaller than the diameter of the outer wall of the inlet section 11 and the first outlet section 15, and the outer wall of the contraction section 12 axially contracts from the outer wall of the inlet section 11 to the outer wall of the throat 13, and the outer wall of the diffusion section 14 axially expands from the outer wall of the throat 13 to the outer wall of the first outlet section 15, and this section of zigzag structure forms a local triangular stable space between the outer wall of the venturi tube 1 and the inner wall of the protecting sleeve 2, thereby improving the compressive strength of the inlet section 11, the contraction section 12, the throat 13, the diffusion section 14 and the first outlet section 15. Further improve, all be provided with the first leather collar 19 that is used for the fastening on the outer wall of entry section 11 and first export section 15, the existence of first leather collar 19 makes venturi 1 plug in protective sleeve 2 more smooth laborsaving, can play the guard action to venturi 1's outer wall simultaneously. Further improve, the outer wall of third export section 17 also extrudees each other with the inner wall of protective sleeve section of thick bamboo 2, further improve the fixed steadiness of registrate between venturi 1 and protective sleeve section of thick bamboo 2, make the space between 16 outer walls of second export section and the protective sleeve section of thick bamboo 2 inner wall along vertical direction by the shutoff simultaneously, after atomizing air enters into the inner chamber of protective sleeve section of thick bamboo 2 from atomizing through-hole 21, only can enter into venturi 1's inner chamber from the atomizing gas port 18 on second export section 16 and mix with powder coating, the utilization efficiency of atomizing air has been improved greatly, the energy is saved, the atomization effect has still been improved.

The venturi powder absorbing assembly a needs to be installed in the powder supplying pump b for use, as shown in fig. 5, the powder supplying pump b comprises a venturi powder absorbing assembly a, a four-way housing 3, a powder cup device 4, a compressed air connector 5 and an atomizing air connector 6, the four-way housing 3 is provided with an assembly insertion groove 31 for the venturi powder absorbing assembly a to be inserted, a side insertion groove 32 for the powder cup device 4 to be inserted, a first insertion groove 33 for the compressed air connector 5 to be inserted and a second insertion groove 34 for the atomizing air connector 6 to be inserted, wherein the first insertion groove 33 and the assembly insertion groove 31 are mutually communicated along the vertical direction, the side insertion groove 32 is communicated with the first insertion groove 33 along the horizontal direction, and the second insertion groove 34 is communicated with the assembly insertion groove 31 along the horizontal direction. The working principle of the powder supply pump b is as follows: firstly, compressed air is introduced into the first insertion groove 33 by the compressed air connector 5, negative pressure is formed at the position, the powder coating in the powder cup device 4 is adsorbed into the area between the first insertion groove 33 and the component insertion groove 31 from the side edge insertion groove 32, then the powder coating is conveyed upwards by the compressed air into the inner cavity of the venturi tube 1, the powder coating reaches the second outlet section 16 under the action of the venturi effect, at the moment, the atomized air is introduced from the second insertion groove 34 by the atomized air connector 6, and the atomized air enters the inner cavity of the venturi tube 1 through the atomized through hole 21 and the atomized air port 18 to scatter powder particles, so that sufficiently and uniformly mixed powder and air are realized. The venturi powder suction assembly a, the powder cup device 4, the compressed air connector 5 and the atomization air connector 6 are all inserted with the four-way shell 3.

Because the venturi inhales among the subassembly inserting groove 31 that powder subassembly an advances four-way housing 3 in this embodiment is realized through the grafting of protective sleeve 2 with subassembly inserting groove 31, if directly make the holistic outer wall of protective sleeve 2 and the inner wall contact of subassembly inserting groove 31, then the resistance is too big, be not convenient for the dismouting, so this embodiment is fixed with first bulge loop 23 on protective sleeve 2 outer wall an organic whole, second bulge loop 24 and third bulge loop 25, the specification of three is unanimous, protective sleeve 2 realizes pegging graft through the periphery of above-mentioned three kinds of bulge loops and the extrusion of subassembly inserting groove 31, reduce the resistance through the area of contact who reduces with subassembly inserting groove 31, make the dismouting more convenient. Fig. 4 shows that grooves are formed between the two second convex rings 24 and between the first convex ring 23 and the third convex ring 25, and in the specific implementation, the rubber ring is sleeved in the grooves, so that the sealing performance is improved, and the plugging and unplugging are smooth and labor-saving. Fig. 4 shows that the two first convex rings 23 sandwich the atomizing through hole 21, after the venturi powder absorbing assembly a is installed in the assembly inserting groove 31, an annular region is formed between the atomizing through hole 21 and the assembly inserting groove 31, and the region is blocked by the two first convex rings 23 in the vertical direction, so that although the atomizing air enters the assembly inserting groove 31 from only one side, the atomizing air can flow in the annular region, and then enters the inner cavity of the protective sleeve 2 from the plurality of atomizing through holes 21, and the atomizing air does not overflow in the process, which not only effectively improves the utilization rate of the atomizing air, but also improves the efficiency of the atomizing air entering the venturi tube 1, thereby improving the atomizing effect. In this embodiment, the outer wall of the protective sleeve 2 is further integrally fixed with a blocking ring 26, and the diameter of the blocking ring 26 is larger than the diameter of the inner wall of the component insertion groove 31, so that the insertion depth is limited.

Fig. 7 shows that the powder cup device 4 comprises a conical powder cup 41 and a powder feeding pipe 42 extending along the horizontal direction, the conical powder cup 41 is provided with a filling opening 411 with an upward opening and a first powder feeding opening 412 with a downward opening, the first powder feeding opening 412 is communicated with the powder feeding pipe 42, and one side end part of the powder feeding pipe 42 is provided with a second powder feeding opening 421 and can be rotatably inserted and matched with the side inserting groove 32. In actual spraying, when the angular position of the powder supply pump b changes, the powder feeding pipe in the powder cup device can rotate around the axis of the powder feeding pipe after being inserted into the side insertion groove, so that the powder cup device 4 can be rotated to maintain the filling opening 411 of the cone-shaped powder cup 41 in an upward state as much as possible, and the powder coating in the cone-shaped powder cup 41 is prevented from being scattered. In addition, the prior art mentions that the flow rate of the powder coating injected into the venturi can be changed by changing the flow rate of the compressed air while the powder coating mixed with the compressed air travels in the venturi, but this causes the amount of the compressed air that drives the powder coating to travel to be reduced, and the force with which the powder coating is pushed to be reduced, thereby affecting the spraying quality. Therefore, in the present embodiment, the adjusting valve 43 for adjusting the powder feeding amount is disposed on the powder feeding pipe 42 below the first powder feeding port 412, i.e. the powder amount is limited before the powder coating enters the four-way housing 3, and the powder feeding amount does not need to be changed by changing the compressed air amount, thereby ensuring that the spraying quality is not affected.

Contain venturi inhales powder subassembly a supply powder pump b mainly used in the powder coating spray gun, as the powder coating electrostatic spray gun that fig. 8 shows, including supplying powder pump b and electrostatic spray gun c, electrostatic spray gun c includes rifle body 7 and stock 8, and stock 8 is inside to be provided with and to be linked together and extend to the conveyer pipe 9 of stock 8 lower extreme with rifle body 7 inside, supplies powder pump b to inhale powder subassembly a through the venturi and pegs graft on conveyer pipe 9. In this embodiment, the upper end of the protecting sleeve 2 is exposed outside the four-way housing 3, the powder supply pump b and the electrostatic spray gun c are installed by inserting the protecting sleeve 2 into the conveying pipe 9, and the outer wall of the front end of the protecting sleeve 2 is provided with a second leather ring 22 for fastening. And install the lower extreme that supplies powder pump b at stock 8 then effectively avoid the operator to be influenced by supplying powder pump b when handheld electrostatic spray gun c, it is more convenient to hand.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A venturi powder suction assembly is characterized by comprising a venturi tube (1) and a protective sleeve (2) sleeved outside the venturi tube (1), wherein the venturi tube (1) comprises an inlet section (11), a contraction section (12), a throat (13), a diffusion section (14), a first outlet section (15), a second outlet section (16) and a third outlet section (17) which are sequentially connected and coaxial; the diameter of the inner cavity of the throat (13) is the smallest, the inner cavity of the contraction section (12) is contracted from the inner cavity of the inlet section (11) to the inner cavity of the throat (13) along the axial direction, and the inner cavity of the diffusion section (14) is expanded from the inner cavity of the throat (13) to the inner cavity of the first outlet section (15) along the axial direction; the protective sleeve (2) is provided with an atomization through hole (21) for communicating the inner cavity of the protective sleeve to the outside, a space is reserved between the outer wall of the second outlet section (16) and the inner wall of the protective sleeve (2), and the second outlet section (16) is provided with an atomization air port (18) for communicating the inner cavity of the second outlet section to the atomization through hole (21).

2. A venturi powder suction assembly according to claim 1, wherein the atomizing orifices (18) are arranged in a circumferential array around the central axis of the second outlet section (16), and each atomizing orifice (18) radially corresponds to one of the atomizing through-holes (21).

3. A venturi powder suction assembly according to claim 1, wherein the venturi tube (1) is fixed by pressing the outer wall of the inlet section (11) and the outer wall of the first outlet section (15) against the inner wall of the protective sleeve (2).

4. A venturi powder suction assembly according to claim 3, wherein the outer wall of the third outlet section (17) is pressed against the inner wall of the protective sleeve (2).

5. A venturi suction powder assembly according to claim 3, characterized in that the throat (13) has an outer wall diameter smaller than the outer wall diameters of the inlet section (11) and the first outlet section (15), and the outer wall of the convergent section (12) converges axially from the outer wall of the inlet section (11) to the outer wall of the throat (13), and the outer wall of the divergent section (14) diverges axially from the outer wall of the throat (13) to the outer wall of the first outlet section (15).

6. Venturi powder suction assembly according to claim 5, characterized in that the outer wall of the inlet section (11) and the outer wall of the first outlet section (15) are provided with a first leather collar (19) for fastening.

7. A powder supply pump, characterized in that, comprises a Venturi powder suction component (a) according to any one of claims 1 to 6, a four-way shell (3), a powder cup device (4), a compressed air connector (5) and an atomizing air connector (6), the four-way shell (3) is provided with an assembly insertion groove (31) for inserting the Venturi powder absorption assembly (a), a side insertion groove (32) for inserting the powder cup device (4), a first insertion groove (33) for inserting the compressed air connector (5) and a second insertion groove (34) for inserting the atomization air connector (6), the first plug groove (33) and the component plug groove (31) are communicated with each other along the vertical direction, the side edge inserting groove (32) is communicated with the first inserting groove (33) along the horizontal direction, the second insertion groove (34) is communicated with the component insertion groove (31) along the horizontal direction.

8. A powder supplying pump according to claim 7, wherein the powder cup device (4) comprises a conical powder cup (41) and a powder supplying pipe (42) extending along the horizontal direction, the conical powder cup (41) is provided with a filling opening (411) with an upward opening and a first powder supplying opening (412) with a downward opening, the first powder supplying opening (412) is communicated with the powder supplying pipe (42), and one side end part of the powder supplying pipe (42) is provided with a second powder supplying opening (421) and can be rotatably inserted and matched with the side inserting groove (32).

9. A powder supply pump according to claim 8, wherein a regulating valve (43) for regulating the powder feeding amount is provided at a portion of the powder feeding pipe (42) below the first powder feeding port (412).

10. An electrostatic spray gun for powder coating materials, characterized in that it comprises a powder supply pump (b) according to any one of claims 7 to 9, and further comprises an electrostatic spray gun (c), wherein the electrostatic spray gun (c) comprises a gun body (7) and a gun handle (8), a delivery pipe (9) communicated with the inside of the gun body (7) and extending to the lower end of the gun handle (8) is arranged inside the gun handle (8), and the powder supply pump (b) is inserted into the delivery pipe (9) through the venturi powder suction component (a).

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